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Question

Difficulty: EasyBrake Failure

Turning the ignition key to the off position while traveling at highway speeds is an approved emergency procedure to bring a commercial motor vehicle to a stop during sudden service brake failure.

Answer: Answer

Answer

False. Turning off the ignition while moving can lock the steering column and disables power steering assist, resulting in a dangerous loss of vehicle control.
The statement is false because turning off the ignition switch while a commercial motor vehicle is in motion cuts power steering assist and can lock the steering column on many vehicles. Proper emergency responses to brake failure require keeping the engine running so the driver can downshift to utilize engine braking, modulate emergency braking systems, and steer toward an escape route or safe stopping location.

Step-by-Step Solution

1
Identify the risks associated with turning off the vehicle ignition while moving.
Shutting off the engine removes power steering assistance and may activate the steering column lock mechanism.
Maintaining directional control is critical during any emergency brake loss.
2
Determine the proper CDL emergency procedures for total service brake failure.
Approved procedures include downshifting to utilize engine braking, pumping hydraulic brakes (if applicable), cautiously applying parking or emergency brakes, and identifying an escape path.
These actions decelerate the vehicle while preserving the driver's ability to steer safely.
3
Evaluate the statement based on commercial driving safety standards.
The statement proposes a prohibited and hazardous action.
Turning off the ignition increases crash severity and eliminates steering capability.

Key Concept

Ignition and Steering Safety During Brake Failure
Estimated Time:45s
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Topics

Brake Failure

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